SOLUTION: John can paint a wall in 9 days and Kyle paints the same wall in 15 days. Find out: a) how long it will take for John and Kyle to paint the wall together and b) if Kyle started pai

Question 832191: John can paint a wall in 9 days and Kyle paints the same wall in 15 days. Find out: a) how long it will take for John and Kyle to paint the wall together and b) if Kyle started painting the wall, and John joins after 5 days, how many additional days will it take them to complete the job
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of painting to get their
rate painting together
( 1 wall / 9 days ) + ( 1wall / 15 days ) = ( 1 wall / x days )

Multiply both sides by

They can paint the wall in 5.625 days painting together
----------------------
If Kyle paints for days, I can say:

So, Kyle paints of the wall in days
There is of the wall left to paint
Now I can say:

It will take 2.5 more days to complete the job

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